CVE-2017-8781
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedXnView Classic for Windows Version 2.40 allows user-assisted remote attackers to execute code via a crafted JPEG 2000 file that is mishandled during the opening of a directory in "Browser" mode, because of a "Stack Buffer Overrun" issue.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceXnView Classic for Windows Version 2.40 contains a stack buffer overrun vulnerability in its JPEG 2000 file parsing logic. The vulnerability is triggered when a user opens a directory in Browser mode containing a specially crafted JPEG 2000 file, allowing remote attackers to execute arbitrary code.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 2.40CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed XnView Classic versionOpen XnView Classic, go to Help > About, or right-click the executable and select Properties > Details to view the version number. Compare it to the affected version 2.40.Affected if The installed version is exactly 2.40
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Confirm JPEG 2000 support is presentVerify that XnView can open .jp2 or .j2k files by attempting to view a JPEG 2000 image, or check Help > Supported Formats to confirm JPEG 2000 is listed as an available format.Affected if JPEG 2000 format support is enabled and functional in the installation
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Identify Browser mode usageCheck if the Browser mode (directory browsing with thumbnail previews) is enabled or commonly used. This mode automatically parses image files in a directory, including JPEG 2000 files for thumbnail generation.Affected if Browser mode is used to navigate directories containing image files
A user is affected if XnView Classic version 2.40 is installed, JPEG 2000 support is present, and Browser mode is used to access directories containing JPEG 2000 files.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataAvoid opening untrusted or unknown JPEG 2000 files in XnView Classic until a patched version is available. Consider upgrading to a newer version of XnView or an alternative image viewer that provides regular security updates.
- Consultation3.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-8781 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2017-8781 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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